Abstract:According to the geological features of the oilfield, simulated reservoir conditions of Gaotaizi reservoir, cycle water injection through numerical simulation was conducted to improve the development effects of Gaotazi and control the velocity of water rising in the blocks. By using numerical simulation method, evaluated velocity sensitivity, the results showed that injection rate had a certain effect on cyclic water injection in different types of sand body, and researched the reasonable working system of cycle water injection in different types of sand body, the results showed that at the same condition of water injection cycle, the development effect of synchronous periodic water injection performed better than that of asynchronous periodic water injection. The reasonable operational procedure of every type of sand body was that production wells would have long-term productions if water was injected into injection wells for 6 months and stopped for another 6 months. In the case of adoption of a reasonable speed and reasonable work into the system, cyclic water injection method can further improve the development effects in every type of sand body of Gaotazi, the research results have very important practical instructional signification for the sustainable development of oil field.